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• Best practices for cross platform git config?

  - by Bas Bossink

  Context A number of my application user configuration files are kept in a git repository for easy sharing across multiple machines and multiple platforms. Amongst these configuration files is .gitconfig which contains the following settings for handling the carriage return linefeed characters [core] autocrlf = true safecrlf = false Problem These settings also gets applied on a GNU/Linux platform which causes obscure errors. Question What are some best practices for handling these platform specific differences in configuration files? Proposed solution I realize this problem could be solved by having a branch for each platform and keeping the common stuff in master and merging with the platform branch when master moves forward. I'm wondering if there are any easier solutions to this problem?

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• How do I determine a best-fit distribution in java?

  - by Eadwacer

  I have a bunch of sets of data (between 50 to 500 points, each of which can take a positive integral value) and need to determine which distribution best describes them. I have done this manually for several of them, but need to automate this going forward. Some of the sets are completely modal (every datum has the value of 15), some are strongly modal or bimodal, some are bell-curves (often skewed and with differing degrees of kertosis/pointiness), some are roughly flat, and there are any number of other possible distributions (possion, power-law, etc.). I need a way to determine which distribution best describes the data and (ideally) also provides me with a fitness metric so that I know how confident I am in the analysis. Existing open-source libraries would be ideal, followed by well documented algorithms that I can implement myself.

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• Pass by reference in Boost::Python

  - by Fabzter

  Hi everybody. Consider something like: struct Parameter { int a; Parameter(){a = 0} void setA(int newA){a = newA;} }; struct MyClass { void changeParameter(Parameter &p){ p.setA(-1);} }; Well, let's fast forward, and imagine I already wrapped those classes, exposing everything to python, and imagine also I instantiate an object of Parameter in the C++ code, which I pass to the python script, and that python script uses a MyClass object to modify the instance of Parameter I created at the beginning in the C++ code. After that code executes, in C++ Parameter instance is unchanged!!! This means it was passed by value (or something alike :S), not by reference. But I thought I declared it to be passed by reference... I can't seem to find Boost::Python documentation about passing by reference (although there seems to be enough doc about returning by reference...). Can anyone give some hint or pointer please?

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• Modify the filter chain - Or select servlet to respond to request using filter

  - by klonq

  I am trying to use a filter to map requests. I am trying to do this for two reasons, firstly to dynamically generate URI's and have them mapped to the appropriate servlet and secondly to catch URI's which are not registered and handle them appropriately. So I'm using a catch-all filter to process the URI and determine the response. I would like some way of modifying the filter chain, or some way to set the servlet which responds to the request from within the filter. I have been unsuccessful using filterConfig.getServletContext().getRequestDispatcher().forward() to send to jsp, ideally though I would like to map to a servlet but can't figure out how. The reason I am not doing this from within a servlet is that I have some URIs which are fixed within web.xml and if I use a catch-all servlet those URIs do not get mapped. Is this possible, is it clean or it going to get really messy?

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• Rails - Help with rake task

  - by jyoseph

  I have a rake task I need to run in order to sanitize (remove forward slashes) some data in the database. Here's the task: namespace :db do desc "Remove slashes from old-style URLs" task :substitute_slashes => :environment do puts "Starting" contents = Content.all contents.each do |c| if c.permalink != nil c.permalink.gsub!("/","") c.save! end end puts "Finished" end end Which allows me to run rake db:substitute_slashes --trace If I do puts c.permalink after the gsub! I can see it's setting the attribute properly. However the save! doesn't seem to be working because the data is not changed. Can someone spot what the issue may be? Another thing, I have paperclip installed and this task is triggering [paperclip] Saving attachments. which I would rather avoid.

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• rename file names from lower case to upper case

  - by Adnan

  Hello, I have about 2k of file that are currently in lower case like: file_one.cfr file_two.cfr .... I am searching for a fast way to rename them to upper case so they would be like; FILE_ONE.cfr FILE_TWO.cfr .... If I use from my shell; for i in *; do mv $i `echo $i | tr [:lower:] [:upper:]`; done I can get all file and the file extensions to upper case. But the extension should remain in lowercase, so my approach does not work. Any programming language is welcome.

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• pass ResultSet from servlet to JSP

  - by Dave

  Hi I am doing the following in my SampleServlet.java //Fill resultset from db ..... try { ArrayList Rows = new ArrayList(); while (resultSet.next()){ ArrayList row = new ArrayList(); for (int i = 1; i <= 7 ; i++){ row.add(resultSet.getString(i)); } Rows.add(row); } request.setAttribute("propertyList", Rows); RequestDispatcher requestDispatcher = getServletContext().getRequestDispatcher("/DisplayProperties.jsp"); requestDispatcher.forward(request,response); # and then in my jsp DisplayPropeties.jsp i have <% ArrayList rows = new ArrayList(); if (request.getSession().getAttribute("propertyList") != null) { rows = (ArrayList ) request.getSession().getAttribute("propertyList"); } %> but rows is allways null. Can anyone help with what I am doing wrong please.

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• Is gchart safe to use?

  - by Paul Tomblin

  The home page for gchart, a client side charting add-in for Google Web Toolkit (GWT), has a long screed about how the project's only maintainer thinks his Google account has been hacked and because of that he will be "disavowing/abandoning my own project and Google account". Does that mean the project is an orphan? Is somebody taking it over? There is always a risk on basing your project on somebody else's code because they may stop supporting it or abandon it during your project's life time, but it seems to me that with the fast evolution of Java and GWT, using gchart in a new project may be a big mistake. Am I right?

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• WPF slow to start on x64 in .NET Framework 4.0

  - by Robert Fraser

  I've noticed that if I build my WPF application for Any CPU/x64, it takes MUCH longer to start (on the order of about 20 seconds) or to load new controls than it does if started on x86 (in release & debug modes, inside or outside of VS). This occurs with even the simplest WPF apps. The problem is discussed in this MSDN thread, but no answer was provided there. This happens only with .NET 4.0 -- in 3.5 SP1, x64 was just as fast as x86. Interestingly, Microsoft seems to know about this problem since the default for a new WPF project in VS2010 is x86. Is this a real bug or am I just doing it wrong? EDIT: Possibly related to this: http://stackoverflow.com/questions/2788215/slow-databinding-setup-time-in-c-net-4-0. I'm using data binding heavily.

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• Popover with embedded navigation controller doesn't respect size on back nav

  - by quixoto

  I have a UIPopoverController hosting a UINavigationController, which contains a small hierarchy of view controllers. I followed the docs and for each view controller, I set the view's popover-context size like so: [self setContentSizeForViewInPopover:CGSizeMake(320, 500)]; (size different for each controller) This works as expected as I navigate forward in the hierarchy-- the popover automatically animates size changes to correspond to the pushed controller. However, when I navigate "Back" through the view stack via the navigation bar's Back button, the popover doesn't change size-- it remains as large as the deepest view reached. This seems broken to me; I'd expect the popover to respect the sizes that are set up as it pops through the view stack. Am I missing something? Thanks.

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• hibernate and ehcache replication

  - by cachingsol

  Hi, I am working on a cache replication solution between nodes Node A - master node = Hibernate + Database + Ehcache as secondary cache Node B - regional node= Ehcache as prmiary cache. no Hibernate Node B is used only as near-by cache for query. Now I am updating data (Say SudentInfo) in Node A, it gets persisted and cached correctly. On replication side (I am using JMS) it sends a message to Node B. But the problem is, the message it sends is of instance CacheEntry(deep Inside Element), there is no way to resurrect the original object (StudentInfo). What I got in node B is CacheEntry with some attributes of Students but not actually an Student Object. Please note that I don't need Hibernate session/persistence in Node B, node B is only for fast query, persistence is done through Node A. So has anybody tried any solution like this? Is there any way to convert CacheEntry to actual object? or Tell ehcache to replicate original object rather than CacheEntry. Thanks for the help

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• Works in firefox but not IE8

  - by creocare

  This is working fine in firefox but only closes the first page and then breaks in IE8. Firebug in IE8 says that x.item(o) is null. I can't figure out why this works in firefox but not IE. Thanks for any help. pager(x=document.getElementsByName("pg1")); function pager( x ) { var curr = document.getElementById('showing'); $(curr).fadeOut('fast'); curr.id = 'hide'; $(x).fadeIn('slow'); x.item(0).id ='showing'; }

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• midl.exe cannot load mscorlib.tlb

  - by Akash

  I'm trying to use midl to turn an idl file into a tlb. However, when I try I get this warning: warning MIDL2015: failed to load tlb in importlib : mscorlib.tlb and I then get a subsequent error: error MIDL2337 : unsatisfied forward declaration : _Object..... I'm certain that the error is due to the first warning. I've tried the same command on a different machine and it succeeds, so I know that the idl file is correct. I've tried uninstalling the .NET framework and reinstalling it in the hope that that would fix things, but it had no effect. So my question is, what do I need to fix on my machine to allow midl to locate mscorlib.tlb once more?

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• Cassandra and asp.net (C#)

  - by Sergey Osypchuk

  I am interested to create portal on cassandra services, since I faced some performance and scale issues starting from 1 million of records. Definitely, it could be solved, but I am interested on other options. My main issues is cost of updating all necessary indexes, to make reading fast. First, is cassandra is good way for asp.net programmers? I mean, maybe there is some other projects, which worth to take a look And second, can you provide any documentation samples on how to start with cassandra programming from C#?

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• Win CE 6.0 client using WCF Services

  - by Sean

  We have a Win CE 6.0 device that is required to consume services that will be provided using WCF. We are attempting to reduce bandwidth usage as much as possible and with a simple test we have found that using UDP instead of HTTP saved significant data usage. I understand there are limitations regarding WCF on .NET Compact Framework 3.5 devices and was curious what people thought would be the appropriate way forward. Would it make sense to develop a custom UDP binding, and would that work for both sides? Any feedback would be appreciated. Thanks.

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• VB FFT - stuck understanding relationship of results to frequency

  - by WaveyDavey

  Trying to understand an fft (Fast Fourier Transform) routine I'm using (stealing)(recycling) Input is an array of 512 data points which are a sample waveform. Test data is generated into this array. fft transforms this array into frequency domain. Trying to understand relationship between freq, period, sample rate and position in fft array. I'll illustrate with examples: ======================================== Sample rate is 1000 samples/s. Generate a set of samples at 10Hz. Input array has peak values at arr(28), arr(128), arr(228) ... period = 100 sample points peak value in fft array is at index 6 (excluding a huge value at 0) ======================================== Sample rate is 8000 samples/s Generate set of samples at 440Hz Input array peak values include arr(7), arr(25), arr(43), arr(61) ... period = 18 sample points peak value in fft array is at index 29 (excluding a huge value at 0) ======================================== How do I relate the index of the peak in the fft array to frequency ?

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• MongoDb vs Ehcache caching advise for speeding up read only mysql Database

  - by paddydub

  I'm building a Route Planner Webapp using Spring/Hibernate/Tomcat and a mysql database, I have a database containing read only data, such as Bus Stop Coordinates, Bus times which is never updated. I'm trying to make the app run faster, each time the application is run it will preform approx 1000 reads to the database to calculate a route. I have setup a Ehcache which greatly improves the read from database times. I'm now setting terracotta + Ehcache distributed caching to share the cache with multiple Tomcat JVMs. This seems a bit complicated. I've tried memcached but it was not performing as fast as ehcache. I'm wondering if a MongoDb would be better suited. I have no experience with nosql but I would appreciate if anyone has any ideas. All i need is quick access to the read only database.

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• What is the fastest way to send 100,000 HTTP requests in Python?

  - by Igor G.

  Hello, I am opening a file which has 100,000 url's. I need to send an http request to each url and print the status code. I am using Python 2.6, and so far looked at the many confusing ways Python implements threading/concurrency. I have even looked at the python concurrence library, but cannot figure out how to write this program correctly. Has anyone come across a similar problem? I guess generally I need to know how to perform thousands of tasks in Python as fast as possible - I suppose that means 'concurrently'. Thank you, Igor

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• UIScrollView and UIImage in it with paging enabled

  - by Infinity

  Hello guys! I need to display 10 - 1000 images on a UIScrollView. Paging is enabled. So every page of the scrollview is an image, it is an uiimage. I can load 10 images to 10 uiimages which stays in the memory, but with 1000 images I have problems on the iPhone or on the iPad. I am trying to unload and then load the images when I am doing scrolling. I every time displays 3 images. The current page image, and the -1 and +1 pages. When I am scrolling I unload the image and then load the next. With this method I have two problems. The scrolling is laggy and if I scroll very fast the images don't appear. Maybe is there any good solution for these problems? Can you suggest me one?

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• A report writer for non-programmers?

  - by Earlz

  Hello, we are wanting for users to be able to write their own reports in our application. It is a web application. We don't care if they must download an application in order to create reports, but we need for them to be able to print off reports from the web in PDF format or similar. The report writer is to be used by non-programmers, or at best very light programmers(like the ones that make VBA macros and such). (the writer is not a core part of the program though. So if there is a learning curve, then that is acceptable to a certain extent) We were looking at Crystal Reports but it seems like it'll cost $7000 which is just way too much for right now(though our system is very flexible so could support it eventually). We are also looking at Fast Reports which seems pretty promising, but I'm not sure the report writer would be easy for non-programmers to grasp. Can someone recommend a good report writer for non programmers that won't break the bank?

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• What is your motivation?

  - by vava

  As software developers we all know that motivation matters. Without it we could just stare into the monitor all day long and do nothing. There are some tricks to get yourself motivated like talking to people or doing the fun part of the project, but they do not always work. In the mean time I started to notice that I am most productive when I could see the person who is appreciating my work. The user, who is using the software and enjoying it. Because if there's none, what's the point of writing this code? So I was wondering, what makes you be at your top, is it the users, your fellow coders or maybe the money you get? PS. I know there's quite a few questions about motivation but they all about overcoming current situation. What I want to hear is what makes you come to the office every day, what you enjoy the most in your job, what makes you want to write this code and do it as fast as you possible could.

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• Callbacks in Thrift Asynchronous Functions?

  - by Roberto Aloi

  Hi all, In Thrift it is possible to use the oneway modifier to specify a call as asynchronous. Apparently, it's not possible to define a callback, though, to be executed when the execution of the function is completed. It seems that the only possibility I have is to give my Thrift client (PHP) some "server" capabilities, so that, when the heavy computation is completed on the server side, I can send a notification to it. This means that I should have a new .thrift file, with new definitions, new services and all the rest and that I should generate php-server side code with Thrift. Even if this is feasible, it looks like an overkill to me and I'm wondering if there's a more clever way to implement the callback. Looking forward for some feedback from you, guys.

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• Embed VLC player in GWT

  - by chrisnfoneur

  Hello, I want to embed a VLC player in my webapp build with Google's GWT. First I had a look at this page: http://wiki.videolan.org/GWT, which offers a nice solution but I add to implements all javascript functions calls (play, stop, fullscreen) with JSNI. Then I found gwt-player (hosted by Google code) which does all the job for me but the annoying part is that the project is not widely used (few posts each month on the project's group, not so many talks about it in blogs/forums...) Do you know another option to easly embed & control a VLC player in a GWT app ? My main goal is to play any video/audio file in a webapp and offer the user a fast/forward feature (set rate in VLC), is there any other player I could use ? I already had a look at Quicktime, Windows Media player & Flowplayer, none of them offers as much features as VLC. Thanks in advance & have a nice new year's eve. Chris

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• Determining your websites color scheme

  - by Steve Hayes

  One of the biggest issues I have, from a UI standpoint, when building a new website is figuring out what colors I will use and of those colors, do they actually work well together. I found this site that has really helped me out and I figured I would share it with all of you and also get some responses back about either sites similar or other ways that you get/figure out your color schemes. Here is the site that I currently use: http://kuler.adobe.com/ With Adobe Kuler, you can chose a base color and it will suggest 5 colors, including your color, that go well with one another. You can, of course, modify the colors it chooses. Also,one of the main features I use, is the image color matching. You can upload an image and it will determine a color scheme based on the colors of the image. So if you have a logo and want to use the colors of the logo, then this works perfectly for you. Thank you and I look forward to your feedback!

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• Should we use Visual Studio 2010 for all SQL Server Database Development?

  - by Luke

  Our company currently has seven dedicated SQL Server 2008 servers each running an average of 10 databases. All databases have many stored procedures and UDFs that commonly reference other databases both on the same server and also across linked servers. We currently use SSMS for all database related administration and development but we have recently purchased Visual Studio 2010 primarily for ongoing C# WinForms and ASP.NET development. I have used VS2010 to perform schema comparisons when rolling out changes from a development server into production and I'm finding it great for this task. We would like to consider using VS2010 for all database development going forward but as far as I understand, we would have to set up ALL databases as projects because of the dependencies on linked servers etc. My question is, do you have any experience using VS2010 for database development in a similar environment? Is it easy to use in tandem with SSMS or is it a one way street once VS2010 projects have been set up for all databases? Can you make any recommendations/impart any experience with a similar scenario? Thanks, Luke

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